Radio Interference Suppression Filters According To Cispr 11/En 55011 Class B; Harmonic Currents - Siemens Sinamics G120 Hardware Installation Manual
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7.7 Electromagnetic compatibility of variable-speed drives
If these preconditions do not apply, then the installation company or company operating
the device must obtain authorization from the grid operator to connect the device
regarding the harmonic currents.
● Inverters with an LO base load current > 75A
There are no standard-related requirements for installing devices such as these.
However, it is recommended to inform the grid operator when connecting such a device.
7.7.2
Radio interference suppression filters according to CISPR 11/EN 55011 Class
B
Under the following preconditions, inverters, frame sizes FSA to FSC - equipped with Class
B filters fromTable 8-6 Assignment table (Page 89) - comply with the limit values for
interference voltages at the power supply connection according to
CISPR 11/EN 55011 Class B:
● The drive system is installed by appropriately qualified personnel in compliance with EMC
regulations - and the installation notes provided in the manual.
● You use a shielded motor cable with low capacitance.
● The motor cable is shorter than 25 m.
7.7.3
Harmonic currents
Table 7- 11
Inverter
FSA ... FSGX
Values referred to the LO input current
1)
78
Example: FSD inverter, 400 V, input current, 72 A:
S
≥ 120 ∙ √3 ∙ 400 V ∙ 72 A
SC
This corresponds to a low-voltage transformer with an apparent power rating of
approximately 300 kVA ... 400 kVA with 4 % ... 6 % U
Harmonic currents (Page 78)
Typical harmonic currents (%) of the inverter
1)
Harmonic number
5th
7th
11th
13th
73
52
25
23
Hardware Installation Manual, 07/2016, A5E36985441C AA
k
17th
19th
23rd
22
15
12
Power Modules PM240
25th
10
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